<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<style type="text/css">
		div{
			height: 200px;
			width: 200px;
			border: 5px dashed red;
			background-color: yellow;
			margin: 100 auto;
			padding: 50px;
			
/*			background-clip: border-box;
*//*			background-clip: padding-box;
*/			background-clip: content-box;/*我的背景色就会content填充.因此这个可以修改我们的背景区域*/
		}
	</style>
	<body>
		<div></div>
	</body>
</html>
